ashton



(No1/10am.) 3 sheets-sheet 1. D. ASHTON.

GRINDING MACHINE. No. 451,192. Patented-11111.28. 1891.

mi'nes 6.3 Inu enten',

THE News PETERS co., Moro-uma., wAsnmoTou, u. c.

3 Sheets-Sheet '2.

(No Model.)

D. ASHTON. GRINDING MACHINE. No. 451,192. Patented Apr. 28, 1891.

FIGB.

J1 B] I) 0.3

4 X u X 1f minesses Inventor' f/Q?. OMNQ DHV/0 SHTo/v,

(No Model.) 3 Sheets-Sheet 3. D. ASHTON.

GRINDING MACHINE.

No. 451,192. Patented Apr. 28.1891.

NiTn STATES DAVID ASHTON, OF SI'IEFFIELD, ENGLAND.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 451,192, dated April 28, 1891. Application tiled May Z2, 1889. Serial No. 811,654. (No model.) Patented in England December 13, 1888,1l`0. 18,196.

To coll whom t may concern,.-

Be it known that I,DAVID ASHTON, engineer, a subject of the Queen of Great Britain and Ireland, and a resident of Sheffield, in the county of York, England, have invented certain new and useful Improvements in Grinding-Machines, (patented to me in Great Britain by Letters Patent No. 18,196, dated December 13, 1888 and I do hereby declare that the following is a full, clear, and exact description thereof, reference being` had to the accompanying drawings, which form a part of this specification.

This invention is fora machine of improved construction and superior grinding or abrasive powers for grinding files, machine-cutters, and

' other similar articles having ilat, curved, or

irregular surfaces, the grinding medium being either the ordinary grindstone,an emerywheel, or the like.

The machine is represented in the annexed sheets of drawings.

Figure 1 is a side elevation of the machine; Fig. 2, a plan of same. Fig. 3 is a front elevation of the machine, partly in section; Fig. 4, an enlarged sectional detail of one of the table-supports, showing side and top Views; Figs. 5 and 6, side and end views of the table and its supports detached, and Fig. 7 a detail of the gearing.

The machine consists of a strong cast-iron trough A, flanged at the top and bottom edges, and supporting two standards B, the front faces of which incline backward at a suitable angle to form a support and slideway for a sliding saddle orhead-stock C, provided with two bearings D at its lower end to carry the axle of the grindstone E, (omitted in Fig. 2,) which is secured in position by screwing it between metal plates F in the usual manner between the bearings D.

Upon one end of the axle ot' the stone E, outside the standard, Iiix a cam G, the groove of which engages with a linger or stud H, so that when the axle revolves a reciprocating movement is imparted to the axle and the stone. This prevents the face of the stone wearing in grooves or ridges or like irregularities and keeps the face ot' the stone true, level, and smooth.

The saddle C, with the grindstone E, which it supports upon its axle, can be either raised or lowered upon the inclined faces of the standards B by means of a centrally-placed screw I, fixed to the top of vsaid saddle and passing through the screwed boss of a worinwheel J, working in the cross-head, which connects the tops ofthe two standards B. The worm-wheel J is operated by a worin K, which is rotated by means of a chain driven by a conveniently-placed hand-wheel L. This arrangement enables the attendant to adjust the grindstone in position as it becomes smaller in diameter by wear or when a new stone is put into the apparatus.

Upon the front end of the trough A, l fix a movable bracket M, forming a continuation of the top part of the trough and carrying a long arm N,'supported on the joint-pin O, upon which it can be raised and lowered, and it can be also fixed at any desired point by means of the nut P, Fig. 1.

On the front end of the arm N, I tix a boxbearing Q, which forms a support for one end of the screw Y, and also carries a pair of skew-wheels R2 R3, Figs. l and 7, one of which is fixed upon the screw Y and its cornpanion upon the driving-shaft R, upon which shaft are also fixed a set of reversing pulleys S, similar to those of a planing-machine, and these I prefer to drive from a counter-shaft R', the brackets of which are fixed to the top of the standards B,'thus making the machine self-contained.

The box-bearing Q is carried upon a joint T, which may be fixed rigidly or may be allowed to move with the rise and fall-of the grinding-table U, to `which the other end of the screw is attached by engaging With the screw-box V, which forms part of the grinding table. The said table is constructed with side plates rising above the face of the table upon whichthe work to be ground is placed,

which is indicated by the dotted lineU in Figs. l and 5, and the top edges of the said sides project or overhang outward at WV, and are provided with slots or other means by which any suitably-shaped templets, Shapers,

or paths U2, Figs. 5 and 6, may be secured underneath the said overhanging edges and be readily iixed and adjusted in position. These templets are made of the desired curve, taper,

IOO

or othei' contigui-ation that it is desired the article on the table should correspond with. The overhanging edges lV of the table U on said teniplets beneath them rest upon and are supported by two rollers X, one on each Side, and the table can he drawn to and fro upon the said rollers, according as the screw Y is caused to revolve in one direction or the otliei by the action of the pulley S, this alternate motion being produced by the ordinary belt-reversing action as used on metal-planing machines or other belt-reversing action worked by the traveling table U. The said rollers X are carried by swing brackets or arms Z, one end being pvoted to the side of the trough A and the other or loose end, to which the roller is fixed, being supported by an adj listing-screw l, passing through the threaded boss or hand-wheel 2, which rests upon an elastic bed or cushion let into the support 3, this arrangement being to avoid rigidity between -tlie stone and the article to be ground. The rollers X are preferably situated so that a line drawn `trom their centers to the center of the stone-E will be parallel with the face of the standards B. This arrangement is to give support to the articles to be ground directly under the point of conl tact between the stone and the article being ground.

The articles to be ground may in some cases be simply laid on the table U; but small articles may be held on plates or placed on trays laid on the table, or other suitable means may be employed, according to the shape or size of the article, as this arrange ment forms no part of this invention. The operation of grinding takes place under the surface of the water, and the water being constantly kept in motion by the movement of the table, the grit or sand held in suspension in the Water aids materially in the operation of grinding.

To enable the face of the stone to be dressed and kept true and square with the face of the table U, I arrange a slide-bed ft on cach side l. The combination, with the grindstoneand means for rotating it, ot a trough containing water which immerses the grindingpoint of the periphery of the stone, a table within said trough supporting the objects to be ground, and mechanism for moving said table back and forth, and thereby agitating the water to keep the contained grit in suspension, substantially as hereinbctore specified.

2. In combination with the grindstone and means for rotating it, a subjacent table, roll-- Vers upon which said table 1s movable back and forth, and elastic supports for said rollers, substantially as hereinbefore specilied.

' In .combination with the grindstone and means for rotating it, a subja-cent table supporting the objects to be ground and supported by a roller on each side thereof, mechanism for reciprocating said table, an arm supporting said mechanism, and means whereby said arm may be adjusted ina vertical plane, substantially as hereinbefore speciied.

In testimony that I claim the foregoing as my own I have affixed hereto my signature, in presence of two witnesses, this lst day of Hay, 1889.

DAVID ASHTON.

Witnesses:

Roer. F. DRURY, B. E. DRURY. 

